2 * MCT (Magic Control Technology Corp.) USB RS232 Converter Driver
4 * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is largely derived from the Belkin USB Serial Adapter Driver
12 * (see belkin_sa.[ch]). All of the information about the device was acquired
13 * by using SniffUSB on Windows98. For technical details see mct_u232.h.
15 * William G. Greathouse and Greg Kroah-Hartman provided great help on how to
16 * do the reverse engineering and how to write a USB serial device driver.
18 * TO BE DONE, TO BE CHECKED:
19 * DTR/RTS signal handling may be incomplete or incorrect. I have mainly
20 * implemented what I have seen with SniffUSB or found in belkin_sa.c.
21 * For further TODOs check also belkin_sa.c.
24 * Basic tests have been performed with minicom/zmodem transfers and
25 * modem dialing under Linux 2.4.0-test10 (for me it works fine).
27 * 04-Nov-2003 Bill Marr <marr at flex dot com>
28 * - Mimic Windows driver by sending 2 USB 'device request' messages
29 * following normal 'baud rate change' message. This allows data to be
30 * transmitted to RS-232 devices which don't assert the 'CTS' signal.
32 * 10-Nov-2001 Wolfgang Grandegger
33 * - Fixed an endianess problem with the baudrate selection for PowerPC.
35 * 06-Dec-2001 Martin Hamilton <martinh@gnu.org>
36 * Added support for the Belkin F5U109 DB9 adaptor
38 * 30-May-2001 Greg Kroah-Hartman
39 * switched from using spinlock to a semaphore, which fixes lots of problems.
41 * 04-May-2001 Stelian Pop
42 * - Set the maximum bulk output size for Sitecom U232-P25 model to 16 bytes
43 * instead of the device reported 32 (using 32 bytes causes many data
44 * loss, Windows driver uses 16 too).
46 * 02-May-2001 Stelian Pop
47 * - Fixed the baud calculation for Sitecom U232-P25 model
50 * - Identify version on module load.
52 * 06-Jan-2001 Cornel Ciocirlan
53 * - Added support for Sitecom U232-P25 model (Product Id 0x0230)
54 * - Added support for D-Link DU-H3SP USB BAY (Product Id 0x0200)
56 * 29-Nov-2000 Greg Kroah-Hartman
57 * - Added device id table to fit with 2.4.0-test11 structure.
58 * - took out DEAL_WITH_TWO_INT_IN_ENDPOINTS #define as it's not needed
59 * (lots of things will change if/when the usb-serial core changes to
60 * handle these issues.
62 * 27-Nov-2000 Wolfgang Grandegger
63 * A version for kernel 2.4.0-test10 released to the Linux community
64 * (via linux-usb-devel).
67 #include <linux/kernel.h>
68 #include <linux/errno.h>
69 #include <linux/init.h>
70 #include <linux/slab.h>
71 #include <linux/tty.h>
72 #include <linux/tty_driver.h>
73 #include <linux/tty_flip.h>
74 #include <linux/module.h>
75 #include <linux/spinlock.h>
76 #include <asm/uaccess.h>
77 #include <linux/usb.h>
78 #include <linux/usb/serial.h>
84 #define DRIVER_VERSION "z2.1" /* Linux in-kernel version */
85 #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>"
86 #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver"
93 static int mct_u232_startup (struct usb_serial *serial);
94 static void mct_u232_shutdown (struct usb_serial *serial);
95 static int mct_u232_open (struct usb_serial_port *port,
97 static void mct_u232_close (struct usb_serial_port *port,
99 static void mct_u232_read_int_callback (struct urb *urb);
100 static void mct_u232_set_termios (struct usb_serial_port *port,
101 struct ktermios * old);
102 static int mct_u232_ioctl (struct usb_serial_port *port,
106 static void mct_u232_break_ctl (struct usb_serial_port *port,
108 static int mct_u232_tiocmget (struct usb_serial_port *port,
110 static int mct_u232_tiocmset (struct usb_serial_port *port,
111 struct file *file, unsigned int set,
113 static void mct_u232_throttle (struct usb_serial_port *port);
114 static void mct_u232_unthrottle (struct usb_serial_port *port);
118 * All of the device info needed for the MCT USB-RS232 converter.
120 static struct usb_device_id id_table_combined [] = {
121 { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) },
122 { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) },
123 { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) },
124 { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) },
125 { } /* Terminating entry */
128 MODULE_DEVICE_TABLE (usb, id_table_combined);
130 static struct usb_driver mct_u232_driver = {
132 .probe = usb_serial_probe,
133 .disconnect = usb_serial_disconnect,
134 .id_table = id_table_combined,
138 static struct usb_serial_driver mct_u232_device = {
140 .owner = THIS_MODULE,
143 .description = "MCT U232",
144 .usb_driver = &mct_u232_driver,
145 .id_table = id_table_combined,
146 .num_interrupt_in = 2,
150 .open = mct_u232_open,
151 .close = mct_u232_close,
152 .throttle = mct_u232_throttle,
153 .unthrottle = mct_u232_unthrottle,
154 .read_int_callback = mct_u232_read_int_callback,
155 .ioctl = mct_u232_ioctl,
156 .set_termios = mct_u232_set_termios,
157 .break_ctl = mct_u232_break_ctl,
158 .tiocmget = mct_u232_tiocmget,
159 .tiocmset = mct_u232_tiocmset,
160 .attach = mct_u232_startup,
161 .shutdown = mct_u232_shutdown,
165 struct mct_u232_private {
167 unsigned int control_state; /* Modem Line Setting (TIOCM) */
168 unsigned char last_lcr; /* Line Control Register */
169 unsigned char last_lsr; /* Line Status Register */
170 unsigned char last_msr; /* Modem Status Register */
171 unsigned int rx_flags; /* Throttling flags */
174 #define THROTTLED 0x01
177 * Handle vendor specific USB requests
180 #define WDR_TIMEOUT 5000 /* default urb timeout */
183 * Later day 2.6.0-test kernels have new baud rates like B230400 which
184 * we do not know how to support. We ignore them for the moment.
186 static int mct_u232_calculate_baud_rate(struct usb_serial *serial, speed_t value, speed_t *result)
190 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID
191 || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) {
193 case 300: return 0x01;
194 case 600: return 0x02; /* this one not tested */
195 case 1200: return 0x03;
196 case 2400: return 0x04;
197 case 4800: return 0x06;
198 case 9600: return 0x08;
199 case 19200: return 0x09;
200 case 38400: return 0x0a;
201 case 57600: return 0x0b;
202 case 115200: return 0x0c;
208 /* FIXME: Can we use any divider - should we do
209 divider = 115200/value;
210 real baud = 115200/divider */
230 static int mct_u232_set_baud_rate(struct usb_serial *serial, struct usb_serial_port *port,
235 unsigned char zero_byte = 0;
236 unsigned char cts_enable_byte = 0;
239 divisor = cpu_to_le32(mct_u232_calculate_baud_rate(serial, value, &speed));
241 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
242 MCT_U232_SET_BAUD_RATE_REQUEST,
243 MCT_U232_SET_REQUEST_TYPE,
244 0, 0, &divisor, MCT_U232_SET_BAUD_RATE_SIZE,
246 if (rc < 0) /*FIXME: What value speed results */
247 err("Set BAUD RATE %d failed (error = %d)", value, rc);
249 tty_encode_baud_rate(port->tty, speed, speed);
250 dbg("set_baud_rate: value: 0x%x, divisor: 0x%x", value, divisor);
252 /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which
253 always sends two extra USB 'device request' messages after the
254 'baud rate change' message. The actual functionality of the
255 request codes in these messages is not fully understood but these
256 particular codes are never seen in any operation besides a baud
257 rate change. Both of these messages send a single byte of data.
258 In the first message, the value of this byte is always zero.
260 The second message has been determined experimentally to control
261 whether data will be transmitted to a device which is not asserting
262 the 'CTS' signal. If the second message's data byte is zero, data
263 will be transmitted even if 'CTS' is not asserted (i.e. no hardware
264 flow control). if the second message's data byte is nonzero (a value
265 of 1 is used by this driver), data will not be transmitted to a device
266 which is not asserting 'CTS'.
269 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
270 MCT_U232_SET_UNKNOWN1_REQUEST,
271 MCT_U232_SET_REQUEST_TYPE,
272 0, 0, &zero_byte, MCT_U232_SET_UNKNOWN1_SIZE,
275 err("Sending USB device request code %d failed (error = %d)",
276 MCT_U232_SET_UNKNOWN1_REQUEST, rc);
278 if (port && C_CRTSCTS(port->tty)) {
282 dbg("set_baud_rate: send second control message, data = %02X", cts_enable_byte);
283 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
284 MCT_U232_SET_CTS_REQUEST,
285 MCT_U232_SET_REQUEST_TYPE,
286 0, 0, &cts_enable_byte, MCT_U232_SET_CTS_SIZE,
289 err("Sending USB device request code %d failed (error = %d)",
290 MCT_U232_SET_CTS_REQUEST, rc);
293 } /* mct_u232_set_baud_rate */
295 static int mct_u232_set_line_ctrl(struct usb_serial *serial, unsigned char lcr)
298 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
299 MCT_U232_SET_LINE_CTRL_REQUEST,
300 MCT_U232_SET_REQUEST_TYPE,
301 0, 0, &lcr, MCT_U232_SET_LINE_CTRL_SIZE,
304 err("Set LINE CTRL 0x%x failed (error = %d)", lcr, rc);
305 dbg("set_line_ctrl: 0x%x", lcr);
307 } /* mct_u232_set_line_ctrl */
309 static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
310 unsigned int control_state)
313 unsigned char mcr = MCT_U232_MCR_NONE;
315 if (control_state & TIOCM_DTR)
316 mcr |= MCT_U232_MCR_DTR;
317 if (control_state & TIOCM_RTS)
318 mcr |= MCT_U232_MCR_RTS;
320 rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
321 MCT_U232_SET_MODEM_CTRL_REQUEST,
322 MCT_U232_SET_REQUEST_TYPE,
323 0, 0, &mcr, MCT_U232_SET_MODEM_CTRL_SIZE,
326 err("Set MODEM CTRL 0x%x failed (error = %d)", mcr, rc);
327 dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
330 } /* mct_u232_set_modem_ctrl */
332 static int mct_u232_get_modem_stat(struct usb_serial *serial, unsigned char *msr)
335 rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
336 MCT_U232_GET_MODEM_STAT_REQUEST,
337 MCT_U232_GET_REQUEST_TYPE,
338 0, 0, msr, MCT_U232_GET_MODEM_STAT_SIZE,
341 err("Get MODEM STATus failed (error = %d)", rc);
344 dbg("get_modem_stat: 0x%x", *msr);
346 } /* mct_u232_get_modem_stat */
348 static void mct_u232_msr_to_state(unsigned int *control_state, unsigned char msr)
350 /* Translate Control Line states */
351 if (msr & MCT_U232_MSR_DSR)
352 *control_state |= TIOCM_DSR;
354 *control_state &= ~TIOCM_DSR;
355 if (msr & MCT_U232_MSR_CTS)
356 *control_state |= TIOCM_CTS;
358 *control_state &= ~TIOCM_CTS;
359 if (msr & MCT_U232_MSR_RI)
360 *control_state |= TIOCM_RI;
362 *control_state &= ~TIOCM_RI;
363 if (msr & MCT_U232_MSR_CD)
364 *control_state |= TIOCM_CD;
366 *control_state &= ~TIOCM_CD;
367 dbg("msr_to_state: msr=0x%x ==> state=0x%x", msr, *control_state);
368 } /* mct_u232_msr_to_state */
371 * Driver's tty interface functions
374 static int mct_u232_startup (struct usb_serial *serial)
376 struct mct_u232_private *priv;
377 struct usb_serial_port *port, *rport;
379 priv = kzalloc(sizeof(struct mct_u232_private), GFP_KERNEL);
382 spin_lock_init(&priv->lock);
383 usb_set_serial_port_data(serial->port[0], priv);
385 init_waitqueue_head(&serial->port[0]->write_wait);
387 /* Puh, that's dirty */
388 port = serial->port[0];
389 rport = serial->port[1];
390 /* No unlinking, it wasn't submitted yet. */
391 usb_free_urb(port->read_urb);
392 port->read_urb = rport->interrupt_in_urb;
393 rport->interrupt_in_urb = NULL;
394 port->read_urb->context = port;
397 } /* mct_u232_startup */
400 static void mct_u232_shutdown (struct usb_serial *serial)
402 struct mct_u232_private *priv;
405 dbg("%s", __FUNCTION__);
407 for (i=0; i < serial->num_ports; ++i) {
408 /* My special items, the standard routines free my urbs */
409 priv = usb_get_serial_port_data(serial->port[i]);
411 usb_set_serial_port_data(serial->port[i], NULL);
415 } /* mct_u232_shutdown */
417 static int mct_u232_open (struct usb_serial_port *port, struct file *filp)
419 struct usb_serial *serial = port->serial;
420 struct mct_u232_private *priv = usb_get_serial_port_data(port);
422 unsigned int control_state;
424 unsigned char last_lcr;
425 unsigned char last_msr;
427 dbg("%s port %d", __FUNCTION__, port->number);
429 /* Compensate for a hardware bug: although the Sitecom U232-P25
430 * device reports a maximum output packet size of 32 bytes,
431 * it seems to be able to accept only 16 bytes (and that's what
432 * SniffUSB says too...)
434 if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID)
435 port->bulk_out_size = 16;
437 /* Do a defined restart: the normal serial device seems to
438 * always turn on DTR and RTS here, so do the same. I'm not
439 * sure if this is really necessary. But it should not harm
442 spin_lock_irqsave(&priv->lock, flags);
443 if (port->tty->termios->c_cflag & CBAUD)
444 priv->control_state = TIOCM_DTR | TIOCM_RTS;
446 priv->control_state = 0;
448 priv->last_lcr = (MCT_U232_DATA_BITS_8 |
449 MCT_U232_PARITY_NONE |
450 MCT_U232_STOP_BITS_1);
451 control_state = priv->control_state;
452 last_lcr = priv->last_lcr;
453 spin_unlock_irqrestore(&priv->lock, flags);
454 mct_u232_set_modem_ctrl(serial, control_state);
455 mct_u232_set_line_ctrl(serial, last_lcr);
457 /* Read modem status and update control state */
458 mct_u232_get_modem_stat(serial, &last_msr);
459 spin_lock_irqsave(&priv->lock, flags);
460 priv->last_msr = last_msr;
461 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
462 spin_unlock_irqrestore(&priv->lock, flags);
464 port->read_urb->dev = port->serial->dev;
465 retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
467 err("usb_submit_urb(read bulk) failed pipe 0x%x err %d",
468 port->read_urb->pipe, retval);
472 port->interrupt_in_urb->dev = port->serial->dev;
473 retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
475 usb_kill_urb(port->read_urb);
476 err(" usb_submit_urb(read int) failed pipe 0x%x err %d",
477 port->interrupt_in_urb->pipe, retval);
484 } /* mct_u232_open */
487 static void mct_u232_close (struct usb_serial_port *port, struct file *filp)
489 unsigned int c_cflag;
491 unsigned int control_state;
492 struct mct_u232_private *priv = usb_get_serial_port_data(port);
493 dbg("%s port %d", __FUNCTION__, port->number);
496 c_cflag = port->tty->termios->c_cflag;
497 if (c_cflag & HUPCL) {
498 /* drop DTR and RTS */
499 spin_lock_irqsave(&priv->lock, flags);
500 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
501 control_state = priv->control_state;
502 spin_unlock_irqrestore(&priv->lock, flags);
503 mct_u232_set_modem_ctrl(port->serial, control_state);
508 if (port->serial->dev) {
509 /* shutdown our urbs */
510 usb_kill_urb(port->write_urb);
511 usb_kill_urb(port->read_urb);
512 usb_kill_urb(port->interrupt_in_urb);
514 } /* mct_u232_close */
517 static void mct_u232_read_int_callback (struct urb *urb)
519 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
520 struct mct_u232_private *priv = usb_get_serial_port_data(port);
521 struct usb_serial *serial = port->serial;
522 struct tty_struct *tty;
523 unsigned char *data = urb->transfer_buffer;
525 int status = urb->status;
535 /* this urb is terminated, clean up */
536 dbg("%s - urb shutting down with status: %d",
537 __FUNCTION__, status);
540 dbg("%s - nonzero urb status received: %d",
541 __FUNCTION__, status);
546 dbg("%s - bad serial pointer, exiting", __FUNCTION__);
550 dbg("%s - port %d", __FUNCTION__, port->number);
551 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
554 * Work-a-round: handle the 'usual' bulk-in pipe here
556 if (urb->transfer_buffer_length > 2) {
559 if (urb->actual_length) {
560 for (i = 0; i < urb->actual_length ; ++i) {
561 tty_insert_flip_char(tty, data[i], 0);
563 tty_flip_buffer_push(tty);
569 * The interrupt-in pipe signals exceptional conditions (modem line
570 * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
572 spin_lock_irqsave(&priv->lock, flags);
573 priv->last_msr = data[MCT_U232_MSR_INDEX];
575 /* Record Control Line states */
576 mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
579 /* Not yet handled. See belin_sa.c for further information */
580 /* Now to report any errors */
581 priv->last_lsr = data[MCT_U232_LSR_INDEX];
583 * fill in the flip buffer here, but I do not know the relation
584 * to the current/next receive buffer or characters. I need
585 * to look in to this before committing any code.
587 if (priv->last_lsr & MCT_U232_LSR_ERR) {
590 if (priv->last_lsr & MCT_U232_LSR_OE) {
593 if (priv->last_lsr & MCT_U232_LSR_PE) {
596 if (priv->last_lsr & MCT_U232_LSR_FE) {
598 /* Break Indicator */
599 if (priv->last_lsr & MCT_U232_LSR_BI) {
603 spin_unlock_irqrestore(&priv->lock, flags);
605 retval = usb_submit_urb (urb, GFP_ATOMIC);
607 err ("%s - usb_submit_urb failed with result %d",
608 __FUNCTION__, retval);
609 } /* mct_u232_read_int_callback */
611 static void mct_u232_set_termios (struct usb_serial_port *port,
612 struct ktermios *old_termios)
614 struct usb_serial *serial = port->serial;
615 struct mct_u232_private *priv = usb_get_serial_port_data(port);
616 struct ktermios *termios = port->tty->termios;
617 unsigned int cflag = termios->c_cflag;
618 unsigned int old_cflag = old_termios->c_cflag;
620 unsigned int control_state;
621 unsigned char last_lcr;
623 /* get a local copy of the current port settings */
624 spin_lock_irqsave(&priv->lock, flags);
625 control_state = priv->control_state;
626 spin_unlock_irqrestore(&priv->lock, flags);
631 * Do not attempt to cache old rates and skip settings,
632 * disconnects screw such tricks up completely.
633 * Premature optimization is the root of all evil.
636 /* reassert DTR and RTS on transition from B0 */
637 if ((old_cflag & CBAUD) == B0) {
638 dbg("%s: baud was B0", __FUNCTION__);
639 control_state |= TIOCM_DTR | TIOCM_RTS;
640 mct_u232_set_modem_ctrl(serial, control_state);
643 mct_u232_set_baud_rate(serial, port, tty_get_baud_rate(port->tty));
645 if ((cflag & CBAUD) == B0 ) {
646 dbg("%s: baud is B0", __FUNCTION__);
647 /* Drop RTS and DTR */
648 control_state &= ~(TIOCM_DTR | TIOCM_RTS);
649 mct_u232_set_modem_ctrl(serial, control_state);
653 * Update line control register (LCR)
658 last_lcr |= (cflag & PARODD) ?
659 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
661 last_lcr |= MCT_U232_PARITY_NONE;
663 /* set the number of data bits */
664 switch (cflag & CSIZE) {
666 last_lcr |= MCT_U232_DATA_BITS_5; break;
668 last_lcr |= MCT_U232_DATA_BITS_6; break;
670 last_lcr |= MCT_U232_DATA_BITS_7; break;
672 last_lcr |= MCT_U232_DATA_BITS_8; break;
674 err("CSIZE was not CS5-CS8, using default of 8");
675 last_lcr |= MCT_U232_DATA_BITS_8;
679 termios->c_cflag &= ~CMSPAR;
681 /* set the number of stop bits */
682 last_lcr |= (cflag & CSTOPB) ?
683 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
685 mct_u232_set_line_ctrl(serial, last_lcr);
687 /* save off the modified port settings */
688 spin_lock_irqsave(&priv->lock, flags);
689 priv->control_state = control_state;
690 priv->last_lcr = last_lcr;
691 spin_unlock_irqrestore(&priv->lock, flags);
692 } /* mct_u232_set_termios */
694 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
696 struct usb_serial *serial = port->serial;
697 struct mct_u232_private *priv = usb_get_serial_port_data(port);
701 dbg("%sstate=%d", __FUNCTION__, break_state);
703 spin_lock_irqsave(&priv->lock, flags);
704 lcr = priv->last_lcr;
705 spin_unlock_irqrestore(&priv->lock, flags);
708 lcr |= MCT_U232_SET_BREAK;
710 mct_u232_set_line_ctrl(serial, lcr);
711 } /* mct_u232_break_ctl */
714 static int mct_u232_tiocmget (struct usb_serial_port *port, struct file *file)
716 struct mct_u232_private *priv = usb_get_serial_port_data(port);
717 unsigned int control_state;
720 dbg("%s", __FUNCTION__);
722 spin_lock_irqsave(&priv->lock, flags);
723 control_state = priv->control_state;
724 spin_unlock_irqrestore(&priv->lock, flags);
726 return control_state;
729 static int mct_u232_tiocmset (struct usb_serial_port *port, struct file *file,
730 unsigned int set, unsigned int clear)
732 struct usb_serial *serial = port->serial;
733 struct mct_u232_private *priv = usb_get_serial_port_data(port);
734 unsigned int control_state;
737 dbg("%s", __FUNCTION__);
739 spin_lock_irqsave(&priv->lock, flags);
740 control_state = priv->control_state;
743 control_state |= TIOCM_RTS;
745 control_state |= TIOCM_DTR;
746 if (clear & TIOCM_RTS)
747 control_state &= ~TIOCM_RTS;
748 if (clear & TIOCM_DTR)
749 control_state &= ~TIOCM_DTR;
751 priv->control_state = control_state;
752 spin_unlock_irqrestore(&priv->lock, flags);
753 return mct_u232_set_modem_ctrl(serial, control_state);
756 static int mct_u232_ioctl (struct usb_serial_port *port, struct file * file,
757 unsigned int cmd, unsigned long arg)
759 dbg("%scmd=0x%x", __FUNCTION__, cmd);
761 /* Based on code from acm.c and others */
764 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
769 /* return count of modemline transitions */
774 dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
775 return(-ENOIOCTLCMD);
779 } /* mct_u232_ioctl */
781 static void mct_u232_throttle (struct usb_serial_port *port)
783 struct mct_u232_private *priv = usb_get_serial_port_data(port);
785 unsigned int control_state;
786 struct tty_struct *tty;
789 dbg("%s - port %d", __FUNCTION__, port->number);
791 spin_lock_irqsave(&priv->lock, flags);
792 priv->rx_flags |= THROTTLED;
793 if (C_CRTSCTS(tty)) {
794 priv->control_state &= ~TIOCM_RTS;
795 control_state = priv->control_state;
796 spin_unlock_irqrestore(&priv->lock, flags);
797 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
799 spin_unlock_irqrestore(&priv->lock, flags);
804 static void mct_u232_unthrottle (struct usb_serial_port *port)
806 struct mct_u232_private *priv = usb_get_serial_port_data(port);
808 unsigned int control_state;
809 struct tty_struct *tty;
811 dbg("%s - port %d", __FUNCTION__, port->number);
814 spin_lock_irqsave(&priv->lock, flags);
815 if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) {
816 priv->rx_flags &= ~THROTTLED;
817 priv->control_state |= TIOCM_RTS;
818 control_state = priv->control_state;
819 spin_unlock_irqrestore(&priv->lock, flags);
820 (void) mct_u232_set_modem_ctrl(port->serial, control_state);
822 spin_unlock_irqrestore(&priv->lock, flags);
826 static int __init mct_u232_init (void)
829 retval = usb_serial_register(&mct_u232_device);
831 goto failed_usb_serial_register;
832 retval = usb_register(&mct_u232_driver);
834 goto failed_usb_register;
835 info(DRIVER_DESC " " DRIVER_VERSION);
838 usb_serial_deregister(&mct_u232_device);
839 failed_usb_serial_register:
844 static void __exit mct_u232_exit (void)
846 usb_deregister (&mct_u232_driver);
847 usb_serial_deregister (&mct_u232_device);
851 module_init (mct_u232_init);
852 module_exit(mct_u232_exit);
854 MODULE_AUTHOR( DRIVER_AUTHOR );
855 MODULE_DESCRIPTION( DRIVER_DESC );
856 MODULE_LICENSE("GPL");
858 module_param(debug, bool, S_IRUGO | S_IWUSR);
859 MODULE_PARM_DESC(debug, "Debug enabled or not");